Kinetically Trapped Supramolecular Assembly of Perylene Dianhydride Derivative in Methanol: Optical Spectra, Morphology, and Mechanisms.
Kinetically Trapped Supramolecular Assembly of Perylene Dianhydride Derivative in Methanol: Optical Spectra, Morphology, and Mechanisms.
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DOI：
10.1002/chem.201604212
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发表时间：
2017-01
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通讯作者：
Baozhong Lü;Shusen You;Pengyu Li;Chen Li;K. Müllen;Meizhen Yin
中科院分区：
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作者：
Baozhong Lü;Shusen You;Pengyu Li;Chen Li;K. Müllen;Meizhen Yin
超分子自组装作为一种突破性的方法在纳米科学和纳米技术领域受到越来越多的关注。在此，苝二酐衍生物（TP-PDA）通过成核生长过程自组装成定义良好的纳米球。利用光谱分析、动态光散射（DLS）和扫描电子显微镜（SEM）研究了这一过程的机理。原位DLS和原位SEM均表明，聚集的纳米球的尺寸随着时间的推移而增加，直到形成平衡的h聚集体。这表明TP-PDA经历了一个动力学捕获的组装，并迅速转变为热力学上有利的形式，这一过程可以通过降低浓度和增加温度来精细调节。弱分子间作用力，如π-π堆叠、氢键和疏溶剂相互作用，在纳米结构的形成中起着重要作用。这项工作启发了我们去探索其他由于常用实验时间尺度的捕获时间短而容易被忽略的动力学捕获的超分子组装。
Supramolecular self-assembly has attracted increasing attention as a breakthrough methodology in the fields of nanoscience and nanotechnology. Herein, a perylene dianhydride derivative (TP-PDA) self-assembles into well-defined nanospheres through a nucleation-growth process. The mechanisms of this process were explored by using spectral analysis, dynamic light scattering (DLS), and scanning electron microscopy (SEM). In situ DLS and in situ SEM both revealed that the size of the aggregated nanospheres increases with time until the formation of equilibrium H-aggregates. This shows that TP-PDA undergoes a kinetically trapped assembly with a rapid transformation into the thermodynamically favored form, and this process can be finely tuned by reducing the concentration and increasing the temperature. Weak intermolecular forces, such as π-π stacking, hydrogen bonding, and solvophobic interactions, play an important role in the formation of nanostructures. This work inspired us to explore other kinetically trapped supramolecular assemblies that might be easily ignored due to the short trapping time of commonly used experimental timescales.